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4. SETTINGS AND PROCEDURES BEFORE OPERATION
MELSEC-A
4.3
Settings
This section describes the setting methods and explains the settings of the
transmission control protocol and communications specifications (data
(
length, sum check, etc.).
After changing the settings, turn the PC CPU power supply OFF and back ON,
or reset the PC CPU.
4.3.1
Setting the dedicated protocol, no-protocol mode, or bidirectional mode
(1)
The method of setting the transmission control protocol and the meaning
of the switch settings are described in the table below.
When the mode switch is set t o
"1"
t o
"8"
and the bidirectional mode
setting area in the buffer memory is set to "I", the no-protocol mode in
the following table changes to thk bidirectional mode.
All mode settings in the following table are in the no-protocol mode.
Mode Setting
Mode Setting
Switch
RS-422
Notes
@
MODE
I
0
I
Unusable
I
-
-
-
-
-
-
I
I
I
*1 :
When the mode switch is set to
" 9
to
"D",
the RS-232C and the
RS-422 interfaces operate as if interlocked with each other.
For connection of computers to RS-232C and
RS-422 individually,
or
for connection of a
printer to the no-protocol interface.
Both interfaces work independently.
evlces connected to
2 interfaces. Data
er can be received
Protocol 1
This mode is used to enable a dedicated
protocol computer link with all devices con-
nected to the RS-232C and RS-422 inter-
faces. Data transmitted by a computer can
be received by the AJ7tC24 designated b y
Protocol 4
the send message. * t
I
E
I
Unusable
I
I
F
I
For module test
I
RS-232C and RS-422 o ~ e r a t e i n d e ~ e n d e n t l v .
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